... because they relied on the LORD God of their fathers. 2 Chronicles 13:18

Theological Wordbook of the Old Testament

 2434     שָׁעַן (šāʿan) lean on, trust in. (ASV and RSV similar.) Occurs only in the Niphal.

The verb šāʿan means primarily to lean on something or someone, as on a staff (Ezk 29:7), a spear (II Sam 1:6), or an arm or hand (II Kgs 5:18; 7:2, 17). The latter use probably refers to the relationship of a king to his confidant or second in command. Most importantly the verb is used figuratively of an attitude of trust. Thus in Prov 3:5 we are told not to rely on, šāʿan, our own understanding. Rather we are to trust the Lord. Ezekiel 29:6–7 vividly illustrates both literal and figurative uses of the word. Egypt is a reed staff (mašʿenet) that breaks in the hand of whomever is foolish enough to lean on it (i.e. trust in Egypt). (Cf. also Isa 10:20; 30:12; 31:1; 50:10.) 
Derivatives
2434a  מִשְׁעָן (mišʿān) support. (ASV and RSV, “stay.”) Used four times. Is used figuratively as that on which one relies. David in II Sam 22:19 says that in the day of calamity God was his effective support. In Isa 3:1 it is used of the basic physical life supports, bread and water, that God will remove from Jerusalem. mašʿēn and mašʿēnâ are used in the same passage with similar meaning.

2434b  מַשְׁעֵן (mašʿēn) support. (ASV and RSV “staff.”) Used once.

2434c  מִשְׁעֵנָה (mišʿēnâ) support. (ASV and RSV, “stay.”) Used once.

2434d  מִשְׁעֶנֶת (mišʿenet) staff, support. (ASV and RSV similar.) Used eleven times.   Elijah had one (II Kgs 4:29–31), as did the Angel of the Lord in Jud 6:21 and the nobles depicted in Num 21:18. In Ps 23:4, the Shepherd’s staff is a comfort to His sheep.

Hermann J. Austel, “2434 שָׁעַן,” ed. R. Laird Harris, Gleason L. Archer Jr., and Bruce K. Waltke, Theological Wordbook of the Old Testament (Chicago: Moody Press, 1999), 945.

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Strong's 

8172 שָׁעַן [shaʿan /shaw·an/] v. A primitive root; TWOT 2434; GK 9128; 22 occurrences; AV translates as “lean” nine times, “stay” five times, “rely” four times, “rest” three times, and “lieth” once. 1 to lean on, trust in, support. 1a (Niphal) to lean, lean upon, support oneself. 1a1 of trust in God (fig).

James Strong, Enhanced Strong’s Lexicon (Bellingham, WA: Logos Bible Software, 2001). -------------------------------------

Dictionary of Biblical Languages with Semantic Domains

9128 שָׁעַן (šā·ʿǎn): v.; ≡ Str 8172; TWOT 2434—1. LN 23.78–23.87 (nif) lean oneself upon, rest against, i.e., pertaining to being in a resting condition, because one is in a stance or position of reclining, lying, or standing, often against an object for support (Ge 18:4; Jdg 16:26; 2Sa 1:6; 2Ki 5:18; 7:2, 17; Job 8:15; Eze 29:7+), note: see also domain LN 17; 2. LN 85.1–85.31 (nif) lie, i.e., pertaining to being in a certain place (Nu 21:15+); 3. LN 31.82–31.101 (nif) rely on, rest in, depend, i.e., have trust and belief in an object to the point of being in jeopardy if the object of trust fails, as a figurative extension of leaning upon a physical object for support (2Ch 13:18; 14:10[EB 11]; 16:7^(2×),8; Job 24:23; Pr 3:5; Isa 10:20^(2×); 30:12; 31:1; 50:10; Mic 3:11+)

James Swanson, Dictionary of Biblical Languages with Semantic Domains : Hebrew (Old Testament) (Oak Harbor: Logos Research Systems, Inc., 1997).