to force, compel, or oblige: He was constrained to admit the offense.
2.
to confine forcibly, as by bonds.
3.
to repress or restrain: Cold weather constrained the plant's growth.
Origin: 1275–1325; Middle English constrei(g)nen < Anglo-French, Middle French constrei(g)n- (stem of constreindre) < Latin constringere.See con-, strain1
mid-14c., from stem of O.Fr. constreindre, from L. constringere "to bind together, tie tightly," from com- "together" + stringere "to draw tight" (see strain (v.)).