against, prep.1aTo fight against s.o., troid le duine. To march against the enemy, gluaiseacht in éadan an namhad. He is against it, tá sé ina aghaidh. They fought man against man, throid siad fear san fhear. I did it against my will, in éadan mo thola a rinne mé é. Against my advice, thar mo chomhairle. Against the rules, in aghaidh na rialacha. The weather is against us, tá an aimsir ag cur orainn. There is no law against it, níl dlí ar bith á thoirmeasc. To brush a hat against the nap, hata a scuabadh in aghaidh stuif. bTo warn s.o. against sth., duine a chur ar a fhaichill ar rud. cTo run, dash, against sth., rith in éadan ruda. He struck his head against the wall, bhuail sé a chloigeann faoin mballa. F: I ran up against him, casadh orm de thaisme é. S.a. COME UP, UP1 1. 5. dHe leant against the wall, lig sé a thaca leis an mballa. eAgainst nature, in aghaidh dola. 2aMy rights (as) against the Government, mo cheartsa os coinne an rialtais. bOver against the school, thall os coinne theach na scoile. 3It shows up against the white background, tá sé an-soiléir ar an urlár bán. 4To make preparation against his return, ullmhú a dhéanamh i gcomhair a theacht ar ais. To buy food against the winter, bia a cheannach faoi choinne an gheimhridh. 5Three this year as against ten last year, trí cinn i mbliana i gcomórtas le deich gcinn anuraidh.