A modifier usually made from a noun or noun phrase and a participle. It can modify a noun or pronoun or the whole of the base sentence to which it is attached.
eg.:
1- Teeth chattering,we waited for hours in the bitter cold.
2- Who is the best person for the job, all things considered?

1: An articulative effort giving prominence to one syllable over adjacent syllables.
2: A mark used in writing or printing to indicate a specific sound value, stress, or pitch, to distinguish words otherwise identically spelled, or to indicate that an ordinarily mute vowel should be pronounced. People with different accents might use an accent mark to indicate they accent a different syllable.