I. to attack, strive against:--Ne biþ cwénlíc þeáw ðætte freoþuwebbe feores onsæce leófne mannan (to strife with a man for his life), Beo. Th. 3889 ; B. 1942. II. to, resist, refuse to comply with a demand:--Ðeáh ðú onsóce ðæt ðú sóþ godu lufian wolde though you have refused to love the true gods, Exon. Th. 254, 8; Jul. 194. Hé ne trúwode ðæt hé sǽmannum onsacan mihte, hord forstandan bearn and brýde. Beo. Th. 5901 ; B. 2954. III. to deny, (a) of persons, to declare that one has no knowledge of a person:--Ne ðé onsæco (-sæcco, Lind.) ic non te negabo, Mk. Skt. Rush. 14, 31. Ðú mé onsæces me negabis, 14, 72. Se ðe mé onsaekeþ (-sæccas, Lind.) beforan monnum, onsaece ic ðone beforan fæder mínum, Mt. Kmbl. 10, 33. (b) to refuse a person what he wants:--Gif huá wil æfter meh gecyme onsæcæ (andsæce, Rush.) hine seolfne abneget semetipsum, 16, 24. (c) to refuse to acknowledge a claim, not to allow the truth of a statement, in a legal sense to deny a charge:--Ne onsace ic náuht, ðæt seó eádignes síe ðæt héhste gód ðises andweardan lífes, Bt. 24, 3 ; Fox 84, 14. Ðá onsóc se óðer, and cwæþ hé him nán feoh ne sealde, Shrn. 127, 26. Hé onsóc (andsóc, Rush.) mid aað, ðæt ic ne conn ðone monno, Mt. Kmbl. Lind. 26, 72, 70. Forðam hié his cræftas onsócon (they would not acknowledge his powers, would not bow down to the golden image), Cd. Th. 230, 1; Dan. 226. Se ðæs onsóce, ðætte sóþ wǽre Waldend, se hié álýsde, 244, 20; Dan. 451. Ðonne sceal hé be. LX. hýda onsacan ðære þiéfþe gif hé áðwyrðe biþ. Gif Englisc onstal gá forþ, onsace be twýfealdum, L. In. 46; Th. i. 130, 13-15: Th. i. 132, l: 28; Th. i. 120, 8. IV. to make excuse:--Ongunnun alle onsaca (-sacca. Lind.) coeperunt omnes excusare. Lk. Skt. Rush. 14, 18. Cf. of-sacan. V. to sacrifice (litaturus, Wrt. Voc. ii. 53, 57. on-sacan