troisc1, v.i. (vn. -oscadh, pp. ~the). Fast. Troscadh sa Charghas, to fast in Lent. Troscadh ar fheoil, to abstain from meat. Throisc mé ar an tobac, I refrained from smoking. Hist:Troscadh ar dhuine, to fast against s.o. (in order to obtain demand or request).