Psalm 46:10 Word Study on CEASE (Step Out of the Traffic)

Cease (the striving is an added word for context) - bolding is mine

7503. רָפָה rāp̱āh: A verb meaning to become slack, to relax, to cease, to desist, to become discouraged, to become disheartened, to become weak, to become feeble, to let drop, to discourage, to leave alone, to let go, to forsake, to abandon, to be lazy. The word occurs forty-five times, often with the word yāḏ (3027), meaning hand, forming an idiomatic phrase that requires careful translation within the context of a particular passage. For example, when Ish-Bosheth, Saul’s son, heard that Abner had died, his hands became feeble, i.e., his courage failed him (2 Sam. 4:1; cf. 2 Chr. 15:7; Isa. 13:7; Jer. 6:24, 50:43; Ezek. 7:17; 21:7[12]). The term was also employed to signify the act of ceasing from something (Judg. 8:3; 2 Sam. 24:16; Neh. 6:9; Ps. 37:8); of leaving someone alone (Ex. 4:26; Deut. 9:14; Judg. 11:37; Job 7:19); of letting go (Job 27:6; Prov. 4:13; Song 3:4); and of abandoning or forsaking someone (Deut. 4:31; 31:6, 8; Josh. 1:5; 10:6; Ps. 138:8). On rare occasions, the term conveyed a state of laziness or complacency (Ex. 5:8, 17; Josh. 18:3; Prov. 18:9).
Baker, W., & Carpenter, E. E. (2003). The complete word study dictionary: Old Testament (p. 1072). Chattanooga, TN: AMG Publishers.

2198      רָפָה (rāpâ) sink down, let drop, be disheartened.

White, W. (1999). 2198 רָפָה. R. L. Harris, G. L. Archer Jr., & B. K. Waltke (Eds.), Theological Wordbook of the Old Testament (electronic ed., p. 858). Chicago: Moody Press.

Relax 

re•lax  \ri-ˈlaks\  verb[Middle English, from Latin relaxare, from re- + laxare to loosen, from laxus loose — more at SLACK](15th century)transitive verb 1 : to make less tense or rigid : SLACKEN 〈relaxed his grip〉 2 : to make less severe or stringent : MODIFY 〈relax immigration laws〉 3 : to make soft or enervated 4 : to relieve from nervous tensionintransitive verb 1 : to become lax, weak, or loose : REST 2 : to become less intense or severe 〈hoped the committee would relax in its opposition〉 3 of a muscle or muscle fiber : to become inactive and lengthen 4 : to cast off social restraint, nervous tension, or anxiety 〈couldn’t relax in crowds〉 5 : to seek rest or recreation 〈relax at the seashore〉 6 : to relieve constipation (leaving this one in because it makes me laugh) 7 : to attain equilibrium following the abrupt removal of some influence (as light, high temperature, or stress)

Merriam-Webster, I. (1996). Merriam-Webster’s collegiate dictionary (10th ed.). Springfield, MA: Merriam-Webster.

Let it go.

Forget it.; Stop worrying about it.  

Don't get so angry about it.  

Let it go. Let it go. Stop fretting. 

McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.