Zaninello and Birch (2020): augments the training data with MWE translations from dictionaries, back translating (Sennrich et al., 2016), target-side sentences with MWEs, or wrapping source MWEs with special tokens

Fadaee et al. (2018): prepends a special token in idiom source sentences

Gamallo and Garcia (2019): unsupervised translation of MWEs by composing cross-lingual word embeddings