Source : WordNet®

hold in
     v 1: close in or confine [syn: {enclose}, {confine}]
     2: lessen the intensity of; temper; hold in restraint; hold or
        keep within limits; "moderate your alcohol intake"; "hold
        your tongue"; "hold your temper"; "control your anger"
        [syn: {control}, {hold}, {contain}, {check}, {curb}, {moderate}]
     3: hold back; keep from being perceived by others; "She
        conceals her anger well" [syn: {conceal}, {hold back}]