WordReference English-French Dictionary © 2014:

Principal Translations/Principales traductions
on the way advadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down." (en route)en chemin advadverbe: modifie un adjectif ou un verbe. Est toujours invariable ! Ex : "Elle est très grande." "Je marche lentement."
 We stopped off on the way and took photos.
 On s'est arrêtés en chemin pour prendre des photos.
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WordReference English-French Dictionary © 2014:

Compound Forms/Formes composées
have one's head screwed on the right way avoir la tête sur les épaules
on the way to [sth] preppreposition: Relates noun or pronoun to another element of sentence--for example, "a picture of John," "She walked from my house to yours." (heading, going)sur le chemin de, en route pour loc prép
on the way to doing [sth] preppreposition: Relates noun or pronoun to another element of sentence--for example, "a picture of John," "She walked from my house to yours." figurative (progressing)sur le point de faire qch loc prép
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'on the way' found in these entries
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