Alternative form of have another think coming

Even the longest and most difficult ventures have a starting point.

(archaic) Contraction of thou art.

plural of thoughtlet

a small or insignificant thought

The cardinal number occurring after nine thousand nine hundred and ninety-eight and before ten thousand, represented in Arabic numerals as 9,999. Represented in Roman numerals as IXCMXCIX.

(intransitive) to consider, think about or evaluate something

plural of train of thought

plural of train of thoughts

plural of thought-process (alternative spelling of thought processes).