full·back 
(flbăk′)
(flbăk′)n. Abbr. FB
1. Football An offensive backfield player whose position is behind the quarterback and halfbacks and who primarily performs offensive blocking and line plunges.
2. Sports A primarily defensive backfield player in field hockey, soccer, or Rugby whose position is near the defensive goal or goal line.
- involutely
- involution
- involutional
- involve
- involved
- involvedly
- involvement
- involver
- invulnerability
- invulnerable
- invulnerableness
- invulnerably
- in waiting
- inward
- inward dive
- inwardly
- inwardness
- inweave
- in well with
- in wheelhouse
- in with
- in/within bounds
- in/with reference to
- in/with regards to
- in/with regard to