ava-√sad P. -sīdati (rarely Ā., e.g. Pot. -sideta MBh. i, 5184
• impf. -sīdata R. iv, 58, 6) to sink (is into water) Suśr. BhP
• to sink down, faint, grow lean ṭṣ. PBr., become exhausted or disheartened, slacken, come to an end, perish, Caus. (p. -sādayat
• ind. p. -sādya) to cause to sink (as, into water) Suśr
• to render downhearted, dispirit, ruin ChUp. MBh. &c
• to frustrate MBh. xii, 2634 R. v, 51, 2

Sanskrit-English Dictionary, by M. Monier William