<p><strong>verb</strong></p><ul><li>(used without object)<ul><li>to make an impression; have an effect or impact (usually followed by on or upon): to impinge upon the imagination; social pressures that impinge upon one's daily life.</li><li>to encroach; infringe (usually followed by on or upon): to impinge on another's rights.</li><li>to strike; dash; collide (usually followed by on, upon, or against): rays of light impinging on the eye.</li></ul></li><li>(used with object)<ul><li>Obsolete. to come into violent contact with.</li></ul></li></ul>