1 to have bad luck

2 to be out of luck

1 to become moldy

1 to protect

2 to defend

3 to guard against

4 to prevent

1 to prevent

2 to guard against

3 to take precautions

1 to prevent

2 to take precautions against

3 to protect

4 to guard against

5 precautionary

6 prophylactic

1 to guard against the unexpected (idiom); just in case

2 prepared for any eventualities

1 frugality in order to prevent destitution (idiom)

1 lit. easy to dodge the spear in the open, hard to avoid a stab in the dark (idiom); it is hard to guard against secret conspiracies

1 lit. easy to dodge the spear in the open, hard to avoid a stab in the dark (idiom); it is hard to guard against secret conspiracies

1 you can't guard against it (idiom)

2 impossible to defend effectively

3 not much one can do about it

4 It can't be prevented.