straighten
transitive & intransitive verbTo make or become straight or straighter.
phrasal verbTo resolve (a confusion or conflict).
phrasal verbTo make less confused or troubled.
See
To make straight, in any sense; specifically, to reduce from a crooked to a straight form.
To become straight; assume a straight form.
transitive verbA variant of
To make straight; to reduce from a crooked to a straight form.
transitive verbTo make right or correct; to reduce to order.
transitive verbto cease laughing or smiling, etc., and compose one’s features.