Princeton's WordNet

1. offside(adj)

   (sport) the mistake of occupying an illegal position on the playing field (in football, soccer, ice hockey, field hockey, etc.)

2. offside, offsides(adverb)

   illegally beyond a prescribed line or area or ahead of the ball or puck

   "the touchdown was nullified because the left tackle was offside"

3. offside(adverb)

   illegally in advance of the ball or puck

Wiktionary

1. offside(Noun)

   An offside play

2. offside(Noun)

   the right side of a road vehicle when facing in the same direction as the vehicle

3. offside(Adjective)

   In an illegal position ahead of the ball

4. offside(Adjective)

   To the side of the road, past the curb and sidewalk, e.g. an offside diner (restaurant.)

5. offside(Adjective)

   Unfavourably located, from the point of view of the player taking a finesse.

Freebase

1. Offside

   Offside is a law in association football which states that if a player is in an offside position when the ball is touched or played by a team-mate, he may not become actively involved in the play. A player is in an offside position if he is closer to the opponent's goal line than both the ball and the second-to-last defender, but only if the player is in his opponent's half of the pitch. "Offside position" is a matter of fact, whereas committing an "offside offence" occurs when a player is "actively involved" and is subject to the interpretation of the referee. Goals scored after committing an offside offence are nullified if caught by the referee.

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