Quite often, reduction in materials dimension promotes unique properties. For example, bulk 2H-MoS 2 is a non-piezoelectric due to its centrosymmetry, whereas the monolayer (also odd numbered layers e.g., trilayer) has no inversion symmetry thus displaying piezoelectric properties . In agreement with the theory , in-plane piezoelectricity in 1H-MoS 2 monolayer, which is comparable to piezo-response of commercially used wurtzite nitrides e.g., d 33 of w -AlN, has been conrmed by recent experiments . However, generally speaking, a high piezo-response in these 2D materials is desired for any device-level applications. Therefore, enhancement of piezoelectricity as well as discovery of new 2D piezoelectrics has drawn a signicant research interest. Typically, 1H-type 2D materials (D 3h symmetry) have been investigated for large piezoelectric response . So far, piezoelectricity has been predicted in several families of non-ferroelectric 2D materials like doped or chemically modied graphene [1012], metal dichalcogenides or oxides, Janus monolayers . Encouragingly, although 2D ferroelectrics are relatively rare to date, giant in-plane piezoelectric response is discovered in ferroelectric monolayers of group-IV monochalcogenides . A moderate out-of-plane piezo-response is also observed in ferroelectric buckled monolayers and In 3 Se 3 nanoakes . Furthermore, co-existence of piezoelectricity and magnetism and their coupling in 2D materials namely vanadium dichalcogenide monolayers and 1H-LaBr 2 monolayer have been investigated. Any strong coupling between piezoelectricity and magnetism can be utilized for making piezoelectric-based multifunctional nano-devices. In this regard, multiferroelectric materials can be rst choice because they usually exhibit good coupling between electric polarization and magnetic order. Piezoelectricity is linked with electric polarization for instance, piezoelectric stress co-ecient (e ij ) is dened as ∂Pi ∂ηj , where strain ∂η j along j-direction induces polarization along i-direction (∂P i ). However, how change in magnetic order will change the piezoresponse in 2D multiferroelectrics where polarization couples with magnetic order remains unanswered to our best knowledge.