come on in
Please enter, as in Come on in, the door's open. This phrase is simply a friendly request to enter one's house or some other place. The related come on in, the water's fine originated as an encouragement (or, sometimes, a command) to a reluctant or fearful swimmer but has been extended to other activities, as in Come on in, the water's fine—this is a great office to work in!
Words nearby come on in
come of,
come of age,
come off,
come off it,
come on,
come on in,
come on strong,
come on to,
come one's way,
come out,
come out ahead