neither fish nor fowl, neither fish nor flesh (something difficult to categorise) / something half-baked, lacking resolution or determination

(idiomatic) all isn’t lost; hope springs eternal

(idiomatic) to be in its infancy

one swallow does not a summer make

"a master has never come falling from heaven"; to become good at something, effort is required; don’t rely on providence

(idiomatic) a request to close an open window letting cold air in despite a bad smell in the room

and they lived happily ever after (formulaic ending of fairy tales)

(informal) once again / (informal) again, one more time

(Namibia) namely / (Namibia) however

again, once more