being offside, and being tackled
Its called Offside, or being in an offside position. Being in an offside position, in and of itself, is not a foul. The foul occurs when the ball is PLAYED to the PERSON in an offside position. You can be "passive", not involved in the play, in an offside position and there is no foul.
A player CAN NOT be called for an offside infringement if not "active in the play" however you can be "active in the play" without playing the ball. A player CAN be in an offside POSITION with out being "active in the play."
Being in the offside position is not an offence. Only when the off side player touches the ball while offside. Then the ref will call the ball dead and a free kick will tack place.
You can avoid being called offside by staying in an onside position until you have possession of the ball. If you are caught offside, you can avoid getting called and penalized by staying away from the play and not becoming involved. If is not an infraction to be in an offside position, unless and until you are involved in the play.
The Cambridge Rules, written in 1848, first introduced the concept of offside.
Sports such as ice hockey, field hockey, American and Canadian football, soccer and rugby have an offside rule.
The offside rule is used in winter sports such as American football and ice hockey.