What does Boxing Day have to do with boxing?
[I]t appears from the earliest quotations ... that the brow in question was that of the beater, not of the beaten party; but it is not evident whether the meaning was 'to beat with one's (frowning) brows,' or 'to beat (?lower) one's brows at.' [OED]Related: Browbeaten; browbeating.
One who intimidates: alternately a party-throwing cheerleader and a sadistic browbeater
To intimidate; strong-arm (1830s+)