Definition of fill out in US English:

fill out

phrasal verb

  • (of a person) put on weight to a noticeable extent.

    • ‘If your body fills out really quickly, sometimes your skin can't renew itself fast enough to keep up.’
    • ‘She has filled out, although she hasn't grown.’
    • ‘He's getting his color back, filling out a little.’
    • ‘But I really feel that when he fills out he's going to be a force to be reckoned with.’
    • ‘When Jack grows a bit more, fills out and becomes older, he could be an excellent prospect for the world of snooker.’
    • ‘Viewers were also curious to see how these kids would handle growing up, filling out, and breaking out.’
    • ‘Rugby players, after they have filled out to their hop-assisted unnatural weight, don't go to games.’
    • ‘That's seven pounds north of their last clash at welterweight, and oddsmakers figure the taller De La Hoya fills out better, and will be the bigger man.’
    • ‘It is a simple repetitive action that should stand up well under pressure, and I can only see it getting better as he matures and fills out a bit.’
    • ‘In the course of time Cora has filled out and is now one of the strongest players in the game.’
    grow fatter, become plumper, become rounder, flesh out, put on weight, gain weight, get heavier
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