Origin: bef. 1000; (n.) ME; OE pliht danger, risk; c. D plicht, G Pflicht duty, obligation; (v.) ME plighten, OE plihtan (deriv. of the n.) to endanger, risk, pledge; c. OHG phlichten to engage oneself, MD plihten to guarantee
To promise or bind by a solemn pledge, especially to betroth.
To give or pledge (one's word or oath, for example).
n. A solemn pledge, as of faith.
[Middle English plighten, from Old English plihtan, to endanger, put at risk, from pliht, danger, risk; see dlegh- in Indo-European roots.] plight'er n.