Proto-Indo-European root meaning "tight, painfully constricted, painful."
It forms all or part of: agnail; anger; angina; angry; angst; anguish; anxious; hangnail; quinsy.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit amhu- "narrow," amhah "anguish;" Armenian anjuk "narrow;" Lithuanian ankštas "narrow;" Greek ankhein "to squeeze," ankhone "a strangling;" Latin angere "to throttle, torment;" Old Irish cum-ang "straitness, want;" Old English enge "narrow, painful," Old Norse angra "to grieve, vex, distress," Gothic aggwus "narrow."