tuck rule
... that the tuck rule prevents National Hockey League players from tucking in their jerseys during games, although it took almost fifty years to enforce it?
... that the <b id="mwAcI"><a href="./Tuck_rule_(ice_hockey)" id="mwAcM" rel="mw:WikiLink" title="Tuck rule (ice hockey)">tuck rule</a></b> prevents <a href="./National_Hockey_League" id="mwAcQ" rel="mw:WikiLink" title="National Hockey League">National Hockey League</a> players from tucking in their jerseys during games, although it took almost fifty years to enforce it?