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on a (subject or activity) kick
Experiencing a particularly intense and constant enthusiasm for some subject or activity. Jim's been on a real cycling kick ever since he bought that new bike. I'm on a bit of a politics kick at the moment, but I reckon it will die down once the election season is over.
1. Literally, an activity that a student does in addition to their studies (the curriculum). With your grades and extracurricular activities, you'll get into any college you want.
2. slang Sexual activity, often that which is clandestine. If Jen didn't come home last night, I bet she and Bill were preoccupied with some extracurricular activities, if you know what I mean.
3. slang Fighting or arguing that occurs among competitors during a sporting event. It looks like both teams were flagged for some extracurricular activity after that last play.
See also: activity
a hive of activity
A bustling or busy place. On Fridays, the school is only a hive of activity until 3:00 PM—then, everyone rushes out to start their weekend.
hive of activity
Fig. a location where things are very busy. The hotel lobby was a hive of activity each morning. During the holidays, the shopping center is a hive of activity.
hum with activity
Fig. [for a place] to be busy with activity. The kitchen hummed with activity as usual. Our main office was humming with activity during the busy season.