to accumulate; to gather; to concentrate
To gather up one's mind
I prefer to do my work as (and when) it comes rather than letting it pile up
to corner; to drive somebody into a corner
To be driven into a corner
to cram; to stuff
to flock; to huddle
to herd (animals or people)
to mix; to merge; to fuse
To fuse two schools (into one)
To quicken one's steps
To press somebody with uninterrupted questions
To summon up all one's strength