Metaphor, metonymy and raising

Metaphor is domain mapping. Metonymy is domain highlighting.

He is a sheep's head.

This saying meaning He is a fool. has:

1. a metaphor: mapping sheep to fools
2. a metonymy: head of a person is made equal to the person himself.

There are several words in Lojban related to expressing metaphors:

1. metfo - x1 (clause) is a metaphor/figurative expression having literal meaning x2
2. pevna - x1: its qualities are represented as a metaphor x2 in dimension x3 (contains two {ce'} places for x1 and x2)
3. pe'a - marks a construct as figurative (non-literal/metaphorical) speech/text

Metaphor or metonymy? A matter of understanding

Lojbanic community generally discourages of metaphors. E.g.

mi claxu lo zifre ditcu I lack free time.

is considered a malglico.

However, it might be the case of incorrect translation + the lack of understanding that metonymy is involved here.

mi claxu lo se zifre se ditcu I lack free time [literally]

might be a better translation that fixes English mixing of te sumti due to the lack of adequate analogs of SE particles in English.