When donations from parents pay for school computers, this is an example of the donations defraying the cost of computers.
Origin of defrayFrench défrayer from Old French defraier from de- (L de), from, off + an unverified form frai (Fr frais, plural ), expense, cost, “damages,” probably from Classical Latin fractum, neuter past participle of frangere, to break
transitive verbde·frayed, de·fray·ing, de·frays
Origin of defrayFrench défrayer from Old French desfrayer des- de- frai expense ( from Latin frāctum ) ( from ) ( neuter past participle of frangere to break ; see bhreg- in Indo-European roots.)
(third-person singular simple present defrays, present participle defraying, simple past and past participle defrayed)
From Middle French desfrayer, French défrayer, from dé- + Old French fraier (“to spend”).