saṃsīdati

  1. to sink down, to lose heart DN.i.248; AN.iii.89 = Pp.65; Thag.681; Ja.ii.330.
  2. to be at an end (said of a path, magga) Vin.iii.131; SN.i.1
    caus saṃsādeti: 1 to get tired, give out MN.i.214; AN.i.288. 2 to drop, fail in AN.iv.398 (pañhaṃ, i.e. not answer) 3 to place DN-a.i.49.

saṃ + sad