Slur: A sound in which the pitch changes smoothly or multiple notes blend together without enunciation. Slurs can be rising, falling, or any combination of both.
Falling: A sound in which the pitch is slurred downward. (See Learning to hear pitch, below.) A phrase or song may also be said to fall if it starts with higher pitches and ends with lower pitches, even if it has ups and downs in-between.
Rising: A sound in which the pitch is slurred upward. (See Learning to hear pitch, below.) An entire phrase or song may also be said to rise if it starts with lower pitches and ends with higher pitches, even if it has ups and downs in-between.
https://www.larkwire.com/birdsong/glossary