Thou art my hiding place
a cover (in a good or a bad, a literal or a figurative sense) -- backbiting, covering, covert, disguise(-th), hiding place, privily, protection, secret(-ly, place).
and my shield
a shield (i.e. the small one or buckler); figuratively, a protector; also the scaly hide of the crocodile -- armed, buckler, defence, ruler, + scale, shield.
to wait; by implication, to be patient, hope -- (cause to, have, make to) hope, be pained, stay, tarry, trust, wait.
in thy word
a word; by implication, a matter (as spoken of) or thing; adverbially, a cause