look-in

Short definition from Wiktionary

Noun

1. 1
   A quick glance.
2. 2
   A brief visit.
3. 3
   A chance to participate, compete, or succeed.
4. 4
   A quick short pass to a receiver running diagonally toward the center of the field.

Verb

1. 1
   To visit a place or person briefly and casually.