[no obj] 1 : to go on someone's land without permission
▪ He told me I was trespassing. ▪ The sign said “No Trespassing.” — often + on ▪ The hunters trespassed on the farmer's land. 2 old-fashioned : to do something that hurts or offends someone — usually + against ▪ We must try to forgive those who trespass against us. 3 formal : to treat someone unfairly especially by asking for or expecting more than is fair or reasonable — often + on or upon ▪ I hope I am not trespassing on/upon your time. [=I hope I am not using too much of your time]
▪ He told me I was trespassing. ▪ The sign said “No Trespassing.” — often + on ▪ The hunters trespassed on the farmer's land.
— tres·pass·er noun, plural tres·pass·ers [count]







