Bolts hold the sign on the pole.
Bolts hold the sign up
"sign up" is a rephrasing of "sign on the 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 s1 x1 x2.(n_sign(x2) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_bolt(x1))