any of various kinds of bean, as the green bean, the unripe pods of which are used as food, usually after stripping off the fibrous thread along the side.
2.
the pod itself.
3.
Informal. a tall, thin person.
Origin
1750-60, Americanism
Examples from the web for string bean
Add a dash of heat and it becomes as tender as a string bean.
ET string bean lures and pumpkin lures have been especially effective.
British Dictionary definitions for string bean
string bean
noun
1.
any of several bean plants, such as the scarlet runner, cultivated for their edible unripe pods See also green bean, wax bean