To cause to become straight.
[S]o / Do these upbear the little world below / Of Education,—Patience, Love, and Hope. / Methinks, I see them group'd in seemly show, / The straiten'd arms upraised, the palms aslope, / And robes that touching as adown they flow, / Distinctly blend, like snow emboss'd in snow.
To become straight.
To put in order; to sort; to tidy up.
to straighten one's affairs, or an account
From straight + -en. Compare Scots strauchten (“to straighten”).
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