Boyd’s Bible Dictionary:

(hunger). Generally foretold and regarded as a judgment (Gen. 12:10; 26:1; 41:54-56; 2 Kings 7).

Concise Bible Dictionary:

One of God's “four sore judgments” which He in past times brought upon the earth, and which He has foretold will again be sent as a punishment. The most severe famines recorded in scripture are the two of seven years' duration; one in the time of Joseph, and the other in the days of Elisha (Gen. 41:27-57; 2 Kings 8:1-2: cf. Ezek. 14:21; Matt. 24:7; Luke 21:11; Rev. 18:8). In speaking of the tribulations that will come upon Israel before the remnant of them are brought into blessing, Amos prophesies that there will be a famine of the “words of Jehovah.” When judgments are falling on them, they will seek for some word from God for guidance and comfort; but will not find it: God will for a time leave them in darkness and perplexity (Amos 8:11-12).