Brûler à petit feu = To wait impatiently, to be on thorns.
Cherchez bien, vous brûlez = Search well, you are getting warm.
[Said to children who are looking for a hidden object, and are getting near it.]
Nous avons brûlé nos vaisseaux = There is no going back now; We mean to fight to the last.
[Agathocles, tyrant of Syracuse, on landing in Africa 317 B.C., burnt his vessels in order to force his soldiers to conquer or to die. William of Normandy (1066) and Cortez (1518) did the same.]
Un acteur qui brûle les planches = An actor who plays with spirit, “go.”
Brûler la politesse = To behave rudely by leaving a person abruptly.
Buisson
*Il n’y a si petit buisson qui ne porte ombre = There is no man, however humble, who cannot aid (or, injure) his superior.
Trouver buisson creux = To find the birds flown.