What do ṣadr and ʿajuz denote in classical Arabic prosody?

Division of Surahs into Verses, Qur’anic Rhythm, and Verse Endings

• Ṣadr is the last foot of a line and ʿajuz its rhyme consonant
• Two obligatory parts of every Qur’anic verse
• Ṣadr and ʿajuz name the first and second metrical feet
• The first and second hemistichs of a poetic line