STRAIGHTEN

Straight″en (?), v. t. [imp. & p. p. Straighted (?); p. pr. & vb. n. Straighting.] 1. 1. To make straight; to reduce from a crooked to a straight form.
2. 2. To make right or correct; to reduce to order; as, to straighten one's affairs; to straighten an account.
To straighten one's face, to cease laughing or smiling, etc., and compose one's features.