Definition of plane sailing in English:

plane sailing

Syllabification: plane sail·ing

Entry from US English dictionary

noun

Nautical
The practice of determining a ship’s position on the theory that it is moving on a plane. See also plain sailing.

Definition of plane sailing in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up