Definition of straight-arm in US English:

straight-arm

verb

[with object]North American
informal
  • Ward off (an opponent) or remove (an obstacle) with the arm straight.

    ‘I straight-armed the door’
    ‘a player notable for straight-arming any would-be tacklers’
    • ‘Within five minutes of the resumption, however, they were down to 14 men after Quinnell straight-armed Lamaison around the neck.’

Pronunciation

straight-arm

/streɪt ɑrm/