貸す (かす) means 'to lend.' This transitive verb is used when you allow someone to use something that belongs to you, temporarily. The item lent is marked with 'を', and the person you lend to with 'に'. For example, 'お金を貸します' (Okane o kashimasu) means 'I lend money.'

貸(か)すは「貸(か)す」という意(い)味(み)です。自(じ)分(ぶん)の物(もの)を一(いち)時(じ)的(てき)に人(ひと)に使(つか)うことを許(ゆる)すときに使(つか)います。「お金(かね)を貸(か)します」