just by; just by doing
Expresses that something happens with just that action alone, emphasizing a minimal cause or means.
This pattern means 'just by doing' and emphasizes that a result occurs with only that action, often implying ease or unexpectedness. It can also mean 'just by being' when attached to nouns, like 'just by being here'.
It is common in both speaking and writing. For verbs, attach だけで to the plain form, as in 食べるだけで. For past tense, it's 食べただけで. The phrase often carries a nuance that the action is enough, and no more is needed.
Note: だけで is different from だけ, which simply means 'only'. だけで adds the sense of 'by means of' or 'with just this action'. For example, 見るだけで means 'just by looking' as a cause or method.