Bolts hold the sign on the pole.
Bolts hold the stop sign up
A sign can be a stop sign. A sign being that bolts hold up can be on a pole.
exists e1 x1 x2 x3.(n_pole(x3) & n_sign(x2) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_bolt(x1))
exists e1 e2 s1 x1 x2 x3.(n_stop(x3) & a_up(s1) & Manner(e2,s1) & Actor(e2,x1) & v_sign(e2) & Theme(e1,x3) & Actor(e1,x2) & v_hold(e1) & (x1 = x2) & n_bolt(x1))