Lend a hand is a common phrase used to indicate offering assistance to someone. There are many different synonyms that can also be used to convey the same meaning. For example, "help out" is a commonly used phrase that means the same thing as lending a hand. "Pitch in" is another phrase that can be used in the same context. Another synonym that can be used is "give a hand" or "give a help." "Assist" and "support" are also appropriate synonyms that can be used in different situations. Overall, there are many different phrases and words that can be used to indicate offering assistance or lending a hand where needed.