Source : WordNet®

throw in
     v 1: add as an extra or as a gratuity
     2: give up in the face of defeat of lacking hope; admit defeat;
        "In the second round, the challenger gave up" [syn: {drop
        out}, {give up}, {fall by the wayside}, {drop by the
        wayside}, {throw in the towel}, {quit}, {chuck up the
        sponge}] [ant: {enter}]
     3: to insert between other elements; "She interjected clever
        remarks" [syn: {interject}, {come in}, {interpose}, {put
        in}, {inject}]