Definition of weak side in US English:

weak side

noun

  • (on sports teams with an odd number of players) the half of an offensive or defensive alignment that has one player fewer.

    • ‘If he departs, the team might end up with a younger player on the weak side.’
    • ‘Playing on the weak side, he led the team in tackles and recovered three fumbles.’
    • ‘He has played all three linebacker positions, and now the team will need a replacement for him on the weak side.’
    • ‘He has shown promise on special teams and will get playing time on the weak side of the defense this season.’
    • ‘Ian Gold, one of the team's must physically gifted players, will start on the weak side.’
    • ‘He is the fast athlete the team needed on the weak side.’