By necessity and Hand-to-mouth

Hand-to-mouth and by necessity are semantically related In some cases you can replace phrase "Hand-to-mouth" with "By necessity", this phrases are similar.

Hand-to-mouth adjective - Less plentiful than what is normal, necessary, or desirable.

By necessity and hand-to-mouth are semantically related in in poverty topic. You can use "By necessity" instead an adverb phrase "Hand-to-mouth".