Also means
lie down, stretch out
Usage Note
Allonger has two common uses: making something longer (allonger une jupe — to let down a skirt hem) and laying something flat. The reflexive s'allonger is the natural way to say 'to lie down' or 'to stretch out on a bed'. La sauce est trop épaisse, il faut l'allonger means to thin the sauce by adding liquid.
Examples
"Il s'allonge sur le canapé."
Natural Translation
He lies down on the sofa.
Literal Translation
He himself-lengthens on the sofa

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