Why do we use the verb help in sentences such as the following to mean something like refrain from?
- I try not to eat junk, but I can't help it.
- I couldn't help laughing.
- I can't help but admire her bravery.
Why do we use the verb help in sentences such as the following to mean something like refrain from?
Two of the OED’s definitions of help are relevant. Definition 11a is:
To remedy, obviate, prevent, cause to be otherwise. (With can, cannot, or some equivalent.) In earlier use usually in passive ‘it cannot be helped’, later in active with personal subject ‘I cannot help it’ = I cannot do anything to remedy or prevent it.
Definition 11b is:
To prevent oneself from, avoid, refrain from, forbear; to do otherwise than. (With can, cannot.)
It is true that in both senses help is often used with a negative word such as no, scarcely or hardly, but that is not always the case. For one thing, it can be used in a question, as in Trollope’s ‘How can I help it that I am not a man and able to work for my bread?’ It can also occur in an if clause following a negative, as it did in Hugh Walpole’s ‘I thought he should not offend the King if he could help it.’ In sense 11a, Pepys even used it without a negative at all: ‘One thing there is in his accounts that I fear may touch me; but I shall help it, I hope’